Engine stop mechanism.



E. H. BRISTOL.

ENGINE STOP MECHANISM.

APPLICATION FILED SEPT. 27, 1910.

Patented Sept. 1, 1914.

2 SHEETSSHEET 1.

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20 W 120 WITNESSES: l6 INVENTOR. W 74/ Z Edgar ILBristol [0 v away/ ,4,, 7

HIE NORRIS PETERS ($0.. PHOTU-LIFHQ, WASHINnmN n r E. H. BRISTOL.

ENGINE STOP MECHANISM.

APPLICATION FILED SEPT. 27, 1910.

Patented Sept. 1, 1914.

2 SHEETS-SHEET 2.

IN VEN TOR. Edgar HBristol ATTORNEYS.

WITNESSES:

lnr NORRIS PEIERS c0 UNITED sTA'rEs PATENT. OFFICE.

EngnBI-I. BRISTOL, or nansa'rncn, connections. assrsnon, BY Ivtns'NnnssIsn MENTS, 'ro THE roxnono COMPANY, or 'FOXBORQ. assncnusnrrs, a conrona,

Til-O MASSACHUSETTS- ENGINE stror MECHANISM." f,

j Patented se 1914.;

Application filed September 27. isle, Serial a. r as a'sa To all whom, it may concern Be it known that LIEDGAR BRISTO a citizen ofthe United States, and a resident of Naugatuck, in the county of New Haven and .State of Connecticut, have invented an Improvement in Engine Stop Mechanisms, of which the following description, in connection with the accompanying drawings, is'a specification, like letters on the drawings representing like parts.

.This invention relates to engine stop mechanisms, and hasfor its object, among other things, to provide'means whereby an engine may be stopped readily from different stations if desired.

The character ofthis invention may be I best understood by reference to the following description of an illustrative embodiment thereof shown in Y the accompanying drawings, wherein ;Figure 1 is aside elevation of aportion of the stop mechanism embodying my invention; Fig. 2 is a front elevation thereof, partly in section; Fig. 3 is a detail plan view of parts shown inFig. 1; Fig. 4 is a horizontal section taken on line 4-4 of Fig. 1; andFigs. 5, 6 and 7 are detail views.

Referring to Figs. 1 and'2 of'the drawings, .an engine shaft 1 to which the fly wheel is attached, loosely supports a valve eccentric 2, which is connected with the valve in the. steam .chest through a rod 3, securedto said eccentric by a twospart strap 4 connected by bolts 5. On one side of this valve eccentric isa fixed clollar6 (see Figs. 2 and 4) having an integral lug 7 projecting from one face thereof'into a semi-circular recess 8 (Fig. 5) in one face of said eccentric for a purpose hereinafter described. Qn the opposite side. of said eccen ric is a drum 9 (Fig. 4) fixed to said shaft and having pins the cam face of said disk 12 and is provided on its periphery with radially projecting stop lugs 15 hereinafter referred to. The contacting cam faces of the cam 12 and cam ring 14 are so shaped that when the parts are .inlthe position showninFig. 4,. with the pins 10 1n engagement with theeccentrio 2, and the enginerunning under normal conditions, the high parts of the cam 12 (see Fig.:-2) are within the'low parts of the cam ring 14, and'viceversa. It willlbe apparent that if the cam ring, 14 is'turned relatively to said camr'disk the lattertogether With the pins 10 will be moved outwardly thereby unclutching said pinsfrom the a centric 2andreleas1ng the latter. 1

Having described the eccentric-andthe means for connecting the same to the engine shaft, 1 will now describe-the mechanism for controlling sa d connecting means- Referring to Fig. 1, mounted ona fixed 2 is aplate 16 having a .coil 1'? thereon, Which .70 part (not shown) adjacent to the eccentric is connected with a battery 18 through the wires 19. The circuit, between said battery and coil is opened and closed bythe push buttons 20 that are located in convenientpositions at pointsdistant from the engine.

Pivotally connected with said plate 1618.

a trip lever 21' having a hook 22 thereon that engagesthe end of a lever 28, which is also pivotally mounted on said plate and having ahook24 at its outerend. Aspring 25 connected with the plate and trip lever normally'holds the hook 22 in engagement with saidlever23, as shown in Fig. 1,, y,

:In operation, the rotation oftheshaft 1 anddrum 9 imparts movement to the eccentrio 2 through theengagement of the pins ldtherewith- If it is desired to stop the enginefrom a remote pointone of the buttons 20 is pressed, thus closing the electric circuit, and the current passing'through the coil 1"? actuates the trip lever 21 and releases e hook 22. ther f ran tl e l er 23 whic is now free and the forward end drops by gravity into the path of the lugs .15 upon the cam ring 14. lVhen one of the lugs is brought up against the hook 24 the cam ring will cometo a full stop and the continued rotation of the shaft 1 andeccentric 2 causes the high parts upon the cam'disk 12 to ride onto the high parts of the cam ring and said disk is thereby moved along the shaft 1,

withdrawing the pins 10 from the eccentric against the resistance of the springs 26. The connection between the eccentric 2 and shaft '1 is now broken or disorganized and the eccentric will hang loosely thereon, swinging free until the lug 7 on the collar 6 (Figs. 2 and 5) engages the end of the recess 8. When freed from the shaft, the eccentric, by its movement, shifts the position of the valve in the steam chest, through the strap 3, so that the steam is admitted to the opposite end of the cylinder, reversing the engine. This action is such that the engine comes to a full stop, the piston cushioning against the steam so admitted and thereby assists in overcoming the inertia of the moving parts. By lifting the lever 23 so that the hook 24 thereof is disengaged from the lug 15 and engaging the hook 22 with said lever, the engine can be started again and the pins 10 will be moved into the eccentric 2 by the springs 26 when said pins are in registration with the holes 11 or the eccentric may be moved back by hand until the clutch pins 10 throw in. The lever is lifted out of the path of the lugs 15 automatically, when the shaft is rotated,'by they contact of the lugs 27 on the cam 12 With the hook 24 of said lever.

It will be understood that my invention is not limited to the particular embodiment shown herein, but that various modifications may be made Without departing from the spirit of my invention.

Claims: 7

1. An engine stop mechanism comprising in combination, a shaft, an eccentric loose thereon, means detachably connecting said eccentric to said shaft, and remotely operable means cooperating therewith for releasing said eccentric from said shaft.

2. An engine stop mechanism comprising in combination, a shaft, an eccentric loose thereon, means detachably connecting said eccentric to said shaft, and remotely operable electrical means cooperating therewith for releasing said eccentric from said shaft.

3. An engine stop mechanism comprising in combination, a shaft, a valve controlling eccentric loosely mounted thereon, cooperat i11 cam members fast and loose on said shaft respectively, and means operable by relative movement of said members for disconnecting one of them from said eccentric.

l. An engine stop mechanism comprising in combination, a shaft, a valve controlling eccentric loosely mounted thereon, cooperating cam members fast and loose on said shaft respectively, means operable by relative movement of said members for disconnecting one of them from said eccentric, and means for causing said relative movement of said members.

An engine stop mechanism comprising in combination, a shaft, a valve controlling eccentric looselv mounted thereon, cooperating cam mem ers fast and loose on said shaft respectively, means operableby relative movement of said members for disconnecting one of them from said eccentric, and latch means for holding one of said members stationary to cause said relative movement.

(3. An engine stop mechanism comprising in combination, a shaft, a valve controlling eccentric loosely mounted thereon, cooperatingcam members fast and loose on said shaft respectively, means operable by relative movement of said members for disconnecting one of them from said eccentric, and electrically operated means for holding one of said members stationary to cause said relative movement. V

7. An engine stop mechanism comprising in combination, a shaft, a valve controlling eccentric loose thereon, and means including a cam device for detachably connecting said eccentric to said shaft to permit said eccentric to turn With or independently of said shaft.

S. in engine stop mechanism'comprising in combination, a shaft, an eccentric loose thereon, and means for connecting said eccentric to said shaft having provision for freeing the same from said shaft including manually controlled means and means operable by the engine.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

. EDGAR H. BRISTOL.

Witnesses:

LAURENCE A. JANNEY, WATSON- E. GOODYEAR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

